Device for converting a continuous rotary motion into intermittent angular motion.



- H. P. E. S. DUSSERIS.

DEVICE FOR CONVERTING A CONTINUOUS ROTARY MOTION INTO INTERMITTENT ANGULAR MOTION.

APPLICATION FILED DEC. 30, 1911.

1,083,523. Patented Jan. 6, 1914.

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fllllllllllllllNHHl P COLUMBIA PLANOGRAPH 50.. WASHINGTON. D. C

H. F. E. S. DUSSERIS.

' DEVICE FOR GONVERTIN G A GON TIN UOUS ROTARY MOTION INTO INTERMITIEN'I' ANGULAR MOTION.

APPLICATION FILED DEC. 30, 1911. 1,083,523. Patented Jan. 6, 1914.

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COLUMBIA PLANOURAPH 430.. WASHINGTON n. n

QUNETEE STATES PATENT @FFIQE.

HENRI FRANQOIS ETIENNE SYLVAIN DUSSERIS, OF PARIS, FRANCE.

DEVICE FOR CONVERTING A CONTINUOUS ROTARY MOTION INTO INTERMITTENT ANGULAR MOTION.

Application filed December 30, 1911.

To all whom it may concern Be it known that I, HENRI FRANQOIS ETIENNE SYLvAIN DUSSERIS, a citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Devices for Converting a Continuous Rotary Motion into Intermittent Angular Motion, of which the following is a specification.

The present invention relates to a device for converting a continuous rotary motion into an intermittent angular motion and it has for its object to provide means whereby the continuous rotary motion of a shaft is used for imparting sudden and equal angular motions to another shaft concentrically arranged with reference to said rotary shaft, at a predetermined time.

A mechanical problem which is very often to be solved, consists in substituting at regu lar intervals for a driven part, another part, which substitution has to be rapidly effected while the parts to be substituted are at rest during the time consumed by this transaction. Various solutions have already been devised, but these solutions are generally based on the use of cams with suitable curvatures and arranged within very complicated devices.

The invention will be better understood by the following description, reference being made to the annexed drawings showing the invention applied, by way of an example, to the exchange of views in a projection lantern.

Figure 1 is an end view of the device. Fig. 2 is a side view thereof, and Fig. 3 is a plan view of one embodiment of the inven tion. Figs. 4 and 5 are longitudinal and cross sections on the lines AA and B-B in Fig. 3, respectively. Fig. 6 shows the invention applied to another type of projection device.

According to Figs. 1 to 5 a device is provided for converting the continuous rotary motion of a shaft 1 into an intermittent rotary motion. According to Fig. 1 the shaft 1 is continuously rotating in the direction of the arrow F and carries at one end a four tooth ratchet wheel 3, which, by means of a pawl A, causes the bridge lever 5 to rotate until the said pawl 4 strikes a screw stop 6. At this moment the pawl is raised and is disengaged from the ratchet tooth of the wheel 3 and thus allows of the bridge lever Specification of Letters Patent.

Patented J an. 6, 1914:.

Serial No. 668,589.

to return to its initial position under the action of the counterweight 7 upon a bar rigidly connected to a pin 15 forming a pivot for the bridge lever 5. The bridge lever will then be carried along again when the next tooth of the ratchet wheel comes into engagement with the pawl A which has been previously brought into engagement with the ratchet-wheel by the action of a spring 8. On the other hand the sleeve 2 carries a set of two ratchet-wheels 9 and 10 secured in any convenient manner the teeth of which are directed in opposite directions; those of the ratchet-wheel 9 being for the backward rotation and those of ratchetwheel 10 for the forward rotation.

The number of teeth of each ratchetwheel is equal to the number of stops made by the sleeve 2 during a revolution thereof, two pawls 11, 12 drawn toward each other by a spring 13, are provided for holding both ratchet-wheels, and with them the sleeve 2 in a position of rest. A boss 14: is arranged on a part rigidly connected to the bridge lever 5, and said boss is subjected to the same alternating motion to which the bridge-lever is subjected. Upon the boss 14 rests a small roller 16 the axle of which is carried by the pawl 12. When the said boss arrives under the roller, the pawl 12 will be lifted and frees one of the teeth of the ratchet-wheel 10 with which it was in engagement. At this time, the sleeve will be free to revolve in the forward direction and such release will take place at the very time when the pawl 4 is raised by the screw 6 and when the pawl 18, rigidly connected to the bridge lever and held by the spring 19, has been brought into engagement with a tooth of the ratchet wheel 9. The weight 7 will then drive the sleeve 2 in the forward direction until the pawl 12 comes into engagement with a tooth of the ratchet-wheel 10. At this time, the pawl 11 will be brought in front of a tooth of the ratchetwheel 9, and the sleeve will a 'ain be brought to rest until a tooth of t e four tooth ratchet-wheel 3 engages the pawl 4.

In the example above described and illustrated in the figures, the device embodying the invention is shown as used for rotating, at regular intervals, a disk carrying views symmetrically arranged in the plane of such disk. Nevertheless it will be understood that the invention could be applied in the same manner for actuating a polygonal section drum 20 carrying, on its circumference, views parallelly arranged to its aXis of rotation 21, as is diagrammatically shown in Fig. 6.

Having thus described and ascertained the nature of my invention and the manner it is to be performed, what I claim is:

An intermittent motion transmitting mechanism comprising in combination, a constantly rotating shaft provided with a ratchet wheel, a weighted rocking means having a pawl engaging said wheel to rock said means, a stop for throwing said pawl out of engagement with said wheel at a predetermined time, a device to be intermit- V tently driven from said shaft and provided with a pair of ratchet wheels with the teeth of one wheel facing opposite the teeth of the other, a pair of pawls engaging the teeth of said device wheels, a pawl on said rocking means engaging the teeth of one of said device wheels, and said rocking means having an element for releasing one of said device pawls when the first named pawl is released, substantially as described.

In testimony whereof I afliX my signature in presence of two witnesses.

HENRI FRANQOIS ETIENNE L SYLVAIN DUSSERIS.

Witnesses VIo'roR Piuivosr,

H. O. Come.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. '0. 

